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Mirrors > Home > MPE Home > Th. List > toponcom | Structured version Visualization version GIF version |
Description: If πΎ is a topology on the base set of topology π½, then π½ is a topology on the base of πΎ. (Contributed by Mario Carneiro, 22-Aug-2015.) |
Ref | Expression |
---|---|
toponcom | β’ ((π½ β Top β§ πΎ β (TopOnββͺ π½)) β π½ β (TopOnββͺ πΎ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | toponuni 22760 | . . . 4 β’ (πΎ β (TopOnββͺ π½) β βͺ π½ = βͺ πΎ) | |
2 | 1 | eqcomd 2730 | . . 3 β’ (πΎ β (TopOnββͺ π½) β βͺ πΎ = βͺ π½) |
3 | 2 | anim2i 616 | . 2 β’ ((π½ β Top β§ πΎ β (TopOnββͺ π½)) β (π½ β Top β§ βͺ πΎ = βͺ π½)) |
4 | istopon 22758 | . 2 β’ (π½ β (TopOnββͺ πΎ) β (π½ β Top β§ βͺ πΎ = βͺ π½)) | |
5 | 3, 4 | sylibr 233 | 1 β’ ((π½ β Top β§ πΎ β (TopOnββͺ π½)) β π½ β (TopOnββͺ πΎ)) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 β§ wa 395 = wceq 1533 β wcel 2098 βͺ cuni 4900 βcfv 6534 Topctop 22739 TopOnctopon 22756 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-sep 5290 ax-nul 5297 ax-pow 5354 ax-pr 5418 ax-un 7719 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ral 3054 df-rex 3063 df-rab 3425 df-v 3468 df-dif 3944 df-un 3946 df-in 3948 df-ss 3958 df-nul 4316 df-if 4522 df-pw 4597 df-sn 4622 df-pr 4624 df-op 4628 df-uni 4901 df-br 5140 df-opab 5202 df-mpt 5223 df-id 5565 df-xp 5673 df-rel 5674 df-cnv 5675 df-co 5676 df-dm 5677 df-iota 6486 df-fun 6536 df-fv 6542 df-topon 22757 |
This theorem is referenced by: toponcomb 22775 kgencn3 23406 |
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